Valve gear for internal-combustion engines



March 22,1927.

G. C. CAPPA VALVE GEAR Foa rINTERNAL coMUsTloN ENGINES Filed March 5. 1925 lll latented Mar. 22, 19274.

entre srss GIULIO CESARE CAPPA, OF TURIN,VITALY.

VALVE GEAR FOR INTERNAL-GOMBUSTION NGINES.

Application led March 5, 1925 Serial No. 13,278, and in Italy March 24, 1924.

ments in the driving means of the valve gears for internal combustion engines, in which the cylinders are arranged in two or more inclined rows, and it is characterized by the fact that the countershafts transmitting the motion to the cam shafts lie in 4the same plane as the cylinders that are operated thereby, this being possible owing to the.

fact that the motion is transmitted from the .driving shaft to an auxiliary shaft and from' operating the above mentioned Y countershafts. Through this arrangement it is possible to remove several inconveniences that are generally met with in the ordinary internal combustion engines where the countershafts lying in planes that are inclined relatively to the plane of the actuated cylinders give rise to diiculties in the assembling andto disarrangements and defective workinv'.

aThe annexed drawings show a constructional form of this arrangement used in connection with a big aviation engine.

Fig. l is a section of the engine taken on the cross plane of symmetry thereof.

Fig. 2 is a section on line 'At-B of Fig. l'.

Fig. 3 is a section on the sameplane as Fig. l, but taken in correspondence with the first countershaft.

Referring to the drawings, l is the eilig-ineV crankshaft provided at one of its ends with a` pinion 2, which operates through an intermediary wh-eel 3, a wheel 4, keyed on a driving shaft 5 operating the ignition device (not shown) and other yauxiliary members hereinafter described. From-said driving shaft motion is transmitted Vthrough a pinion 6 keyed centrally thereon, to a short perpendicular auxiliary shaft 7 provided with two pinions 8 and 9, the first of which is operated by the pinion 6 while the latter transmits the motion to two pinions 10 keyed on the lower end of two hollow counter shafts 1l, arranged in the same planes' as the cylinders andV connected by means of prismatic joints l2 to the shafts 13 transmitting the motion to the cam shafts le ar- 1 ranged on the cylinder heads.

Through the above describedarrangement the assembling and dismounting of the engine are greatly facilitated, as the cylinders may be secured on the base with Aall auxiliary parts alreadyk applied thereon, including the countershaft 13 that will be automatically engaged and exactly in alignment if the lcylinders have been exactly mounted. The shaft 5 will kbe conveniently divided into two parts connected through the hub 6 of the pinion 6, this rendering the'construction of the engineniore economical and the assembling of same easier.

What I claim is:

' 1.y In an internal combustion engine comprisingl two rows of Yoppositely inclined cylinders having overhead valves, and camshafts for operating the latter, the combination with a crank shaft, a driving shaft parallel to the latter and driven thereby, of a short auxiliary shaft lmounted perpendicular to the driving shaft in a plane bisecting the angle formed by theV adjacent rows i of cylinders and in the middle cross plane of the engine, and means operatively connecting the short` auxiliary shaft with the connecting the crank' and driving shafts at` one end, of a Short `auxiliary shaft in said bisecting plane and in the middle cross plane of the engine perpendicular to said kcrank and driving shafts, gears loperatively connecting the driving and auxiliary shafts, counter shafts arrangedV in said-middle cross plane and parallel to the longitudinal' axisV of the cylinders, gears operatively connecting the auxiliary shaft with the counter shafts, and gears connecting the latter with the cam shafts.

Y 3'. In an internal combustion engine oomprising two rows of oppositely inclined cylinders having overhead valves and camV shafts for operating the latter, the combination with a crank shaft, of a centrally divided driving shaft parallel to and driven vby the latter, a pinion having a hub connecting the two parts of the driving shaft, a short auxiliary sha-ft perpendicular to the crank and driving shafts, a pinion on one end of thel auxiliary shaft meshing With the aforesaid pinion7 t-Wo countershaits in the middle cross planeof the engine7 gears connesting the countersl'iafts with the oain shafts, and gears connecting the oountere.

shafts Wtli the auxiliary shaft. 10 In testimony that Irelaim the foregoing as iny invention, I have signed my name.

GIULIO CESARE CAPM. 

